Series RVDM Pressure Relief Valve Series RVDM in-line pressure relief valves feature a primary rolling diaphragm and a secondary flat diaphragm which incorporates the Plast-O-Matic patented Fail-Dry design for added protection. If the rolling diaphragm should fail, liquid will weep through the vent port which is located between the two diaphragms. Leakage indicates maintenance is required and can be conveniently scheduled eliminating an emergency shutdown. The second diaphragm protects the control spring from the liquid. Additionally, the rolling diaphragm eliminates crystallization problems. PP and PVDF available.
For Smooth, Sensitive Operation and the Ultimate in Corrosion Resistance… with No Wetted Elastomers!
Series RVDT in-line relief valves feature a wetted flat Teflon diaphragm to resist both chemical attack and salt crystallization problems. The large, active diaphragm provides for smooth, chatter-free operation. A secondary u-cup seal incorporates the Plast-O-Matic patented Fail Dry® design for added protection. If the rolling diaphragm should fail, liquid will weep through the vent port which is located between the two seals, indicating that maintenance is required. Because the secondary seal prevents liquid from reaching the control spring, maintenance can be conveniently scheduled without need for an emergency shut-down.
Relief: protects systems and equipment from over-pressure/pressure surges.
By-Pass: prevents pumps from “dead heading”.
Back-Pressure: maintains necessary reverse pressure in closed loop systems.
Anti-Siphon: Used on the outlet of a pump wherever gravity or other downstream conditions may create negative pressure (siphon) and drain a tank. The valve is pre-set to open under pump pressure, but close when the pump is off. This valve actually closes tighter when siphon occurs.
Relief Valves Relief valves to prevent overpressures in vessels and lines to handle by-pass flow from pumps. For highly corrosive or pure liquids. “RVT” relief valves feature a non-sticking design utilizing a Teflon shaft passing through (3) U-cup seals. Venting between the upper and center U-cup seals results in our FAIL-DRY design for added protection.
SERIES RVD is an angle pattern design featuring a single diaphragm which is an advantage where salt crystallization problems can cause valve sticking. The standard RVD is available in 1/4′′ and 1/2′′ pipe sizes. Set pressures from 5 to 150 PSI. (1/3 to 10 Bars).
The spring housing, since it is not in contact with liquid, is supplied only in PVC. To assure steadier flow, better pump performance, and to protect pumps from dead heading, use Plast-O-Matic’s Pressure Relief Valve.
Optional pressure seal $15.36. Available on RVT only.
Stainless steel fasteners are standard.
RVD fasteners are stainless steel (standard).
For Polypropylene, PVDF, & Teflon pricing, consult sales office.
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